GRAVITATION, ASTROPHYSICS 
The early stages of evolution of spatially nonhomogeneous models of the Univene

397

NUCLEI, PARTICLES, AND THEIR INTERACTION 
Investigation of transitions between orthohydrogen and parahydrogen for detecting parity violation in the weak interaction

405

Radiative corrections to the vertex form factors in the twodimensional approximation of quantum electrodynamics

409

ATOMS, SPECTRA, RADIATION 
Investigation of SF_{6} molecule absorption in a wide range of infraredlaser intensity

412

Collective radiative effects in a twolevel system

419

Vibrationalrotational excitation of polar molecular ions by charged particles

426

Exchange interaction of an atom with a multiply charged ion

433

Stimulated photoassociation in the field of an intense electromagnetic wave

437

Quasiclassical theory of direct chemical reactions in rapid collisions

440

Method of pseudocoherent states in nonlinear quantum systems

446

Phasing of atomic velocities in the field of a traveling electromagnetic wave

453

PLASMA, GASES 
Excitation of ion oscillations by a freely propagating electron beam

458

Anomalous absorption of microwave radiation by a plasma in the electron cyclotron band

463

Thermal runaway and convective heat transport by fast electrons in a plasma

470

SOLIDS, LIQUIDS 
Ba IBa II phase boundary and the maximum on the melting curve of Bal at high pressures

476

Investigation of metastable current states in superconducting AI, Sn, and In films

479

Resonance between dipole oscillations of atoms and interference modes in crystalline films

486

Dislocationstate spectrum of plastically deformed ngermanium

491

Tunnel transparency of disordered systems

499

Phase transitions of the second kind in crystals containing dislocations

512

Deformationpotential operator for a screw dislocation

520

Calculation of critical exponents by quantum field theory methods

521

Oscillation of the conductivity of carriers with anistropic energy spectrum in a quantizing magnetic field

526

Highfrequency properties of ErFeO_{3} in the ordering region of rareearth systems

532

Electron structure and distribution function of localized states in the Anderson model. The dielectric phase

535

Theory of the magnetic properties of dysprosium orthoferrite

543

Magnetic hyperfine interaction for Co impurity atoms in a PdAu matrix

548

Kinetics of decay of metastable polarized crystals

552

Magnetic oscillations of the momentum distribution of hot photoexcited electrons in semiconductors

559

Change of phonon energy in germanium at pressures up to 3 GPa

564

Auxiliary surface polaritons in the region of resonance with oscillations in a transition layer

567

Differential conductivity of semiconductors with inelastic scattering of electrons

572

Current fluctuations In a strong electric field under conditions of frequent interelectron collisions that ensure a Maxwellian distribution with drift

576

Paramagnetic limit of superconductors with dielectric gap on the Fermi surface

583

Investigation of the effect of surface scattering of electrons on the radiofrequency size effect in tungsten

588

Effect of surface waves on the reflection of sound by a rough surface

592

Cyclotron resonance in metals in weak magnetic fields

597

New approach to the theory of the dielectric constant of a system of interacting electrons

603

Acoustic satellites of helicon resonance

608

Effect of linear defects on the local magnetization of a plane Ising lattice

613
